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Trihybrid Crosses02:27

Trihybrid Crosses

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Trihybrid Crosses
Some of Mendel’s crosses examined three pairs of contrasting characteristics. Such a cross is called a trihybrid cross. A trihybrid cross is a combination of three individual monohybrid crosses. For example, plant height (tall vs. short), seed shape (round vs. wrinkled), and seed color (yellow vs. green).
The F1 generation plants of a trihybrid cross are heterozygous for all three traits and produce eight gametes. Upon self-fertilization, these gametes have an equal...
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Monohybrid Crosses

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Overview
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Dihybrid Crosses01:18

Dihybrid Crosses

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Punnett Squares

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Genetic Screens02:46

Genetic Screens

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Genetic screens are tools used to identify genes and mutations responsible for phenotypes of interest. Genetic screens help identify individuals or a group of people at risk of developing  genetic diseases and help them with early intervention, targeted therapy, and reproductive options.
Forward genetic screens
Forward or “classical” genetic screens involve creating random mutations in an organism’s DNA using radiation, mutagens, or insertion of additional bases, which...
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Multiple Allele Traits

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The Concept of Multiple Allelism
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相关实验视频

Updated: Feb 28, 2026

Discrimintion and Mapping of the Primary and Processed Transcripts in Maize Mitochondrion Using a Circular RT-PCR-based Strategy
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优化玉米的基因组预测,使用多样性小组和多父母种群.

A López-Malvar1,2, R Santiago3, A Butrón3

  • 1Facultad de Biología, Departamento de Biología Vegetal y Ciencias del Suelo, Agrobiología Ambiental, Calidad de Suelos y Plantas, Universidad de Vigo, As Lagoas Marcosende, Unidad Asociada a la Misión Biológica de Galicia (CSIC), Vigo, Spain.

The plant genome
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概括

由于遗传差异,基因组选择在不同的玉米种群中效率较低. 基于相关性的优化训练集对于提高各种生殖质中的预测准确性至关重要.

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科学领域:

  • 植物育种 植物育种
  • 定量遗传学 是一种定量遗传学.
  • 基因组学就是基因组学.

背景情况:

  • 基因组选择 (GS) 使用SNP标记器预测遗传值.
  • GS的有效性取决于遗传性,遗传相似性和人口结构.
  • 将GS应用于多种不同的生殖质是具有挑战性的.

研究的目的:

  • 在两种不同的玉米种群中评估基因组预测模型的质性特征.
  • 评估人口内部和跨人口的预测能力.
  • 研究人口结构对基因组选择效率的影响.

主要方法:

  • 使用了基因组最佳线性无偏预测 (GBLUP) 模型.
  • 分析了两个玉米种群:一个多样性小组和一个MAGIC种群.
  • 评估了与炉质量相关的农学和生化结构特征.

主要成果:

  • 多样性小组显示了比MAGIC群体 (PA = 0.14-0.37) 的更高的遗传性 (≥0.88的开花特征) 和人群内预测能力 (PA = 0.15-0.75).
  • 跨种群预测由于等位基频率和链接不平衡差异而大大降低了预测能力 (PA <0.05).
  • 在训练组中组合种群并没有改善,有时甚至降低了预测准确性.

结论:

  • 基因异质性和种群之间的链接不平衡变异阻碍了稳定标记效应的预测.
  • 优化培训组的组成,考虑到遗传关系和种群结构,对于在多样化的胚胎质中有效的基因组选择至关重要.